/* $Id: rpc_parse.c,v 1.4 2006/05/30 00:00:19 dm Exp $ */
/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user or with the express written consent of
 * Sun Microsystems, Inc.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

/*
 * rpc_parse.c, Parser for the RPC protocol compiler 
 * Copyright (C) 1987 Sun Microsystems, Inc.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rpc/types.h"
#include "rpc_scan.h"
#include "rpc_parse.h"
#include "rpc_util.h"

#define ARGNAME "arg"

static void isdefined (definition *);
static void def_struct (definition *);
static void def_program (definition *);
static void def_enum (definition *);
static void def_const (definition *);
static void def_union (definition *);
static void def_typedef (definition *);
static void get_declaration (declaration *, defkind);
static void get_prog_declaration (declaration *, defkind, int);
static void get_type (char **, char **, defkind);
static void unsigned_dec (char **);

/*
 * return the next definition you see
 */
definition *
get_definition (void)
{
  definition *defp;
  token tok;

  defp = ALLOC (definition);
  get_token (&tok);
  switch (tok.kind) {
  case TOK_STRUCT:
    def_struct (defp);
    break;
  case TOK_UNION:
    def_union (defp);
    break;
  case TOK_TYPEDEF:
    def_typedef (defp);
    break;
  case TOK_ENUM:
    def_enum (defp);
    break;
  case TOK_PROGRAM:
    def_program (defp);
    break;
  case TOK_CONST:
    def_const (defp);
    break;
  case TOK_EOF:
    return (NULL);
  default:
    error ("definition keyword expected");
  }
  scan (TOK_SEMICOLON, &tok);
  isdefined (defp);
  return (defp);
}

static void
isdefined (definition * defp)
{
  STOREVAL (&defined, defp);
}

static void
def_struct (definition * defp)
{
  token tok;
  declaration dec;
  decl_list *decls;
  decl_list **tailp;

  defp->def_kind = DEF_STRUCT;

  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_LBRACE, &tok);
  tailp = &defp->def.st.decls;
  do {
    get_declaration (&dec, DEF_STRUCT);
    decls = ALLOC (decl_list);
    decls->decl = dec;
    *tailp = decls;
    tailp = &decls->next;
    scan (TOK_SEMICOLON, &tok);
    peek (&tok);
  } while (tok.kind != TOK_RBRACE);
  get_token (&tok);
  *tailp = NULL;
}

static void
def_program (definition * defp)
{
  token tok;
  declaration dec;
  decl_list *decls;
  decl_list **tailp;
  version_list *vlist;
  version_list **vtailp;
  proc_list *plist;
  proc_list **ptailp;
  int num_args;
  bool_t isvoid = FALSE;	/* whether first argument is void */
  defp->def_kind = DEF_PROGRAM;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_LBRACE, &tok);
  vtailp = &defp->def.pr.versions;
  tailp = &defp->def.st.decls;
  scan (TOK_VERSION, &tok);
  do {
    scan (TOK_IDENT, &tok);
    vlist = ALLOC (version_list);
    vlist->vers_name = tok.str;
    scan (TOK_LBRACE, &tok);
    ptailp = &vlist->procs;
    do {
      /* get result type */
      plist = ALLOC (proc_list);
      get_type (&plist->res_prefix, &plist->res_type,
		DEF_PROGRAM);
      if (streq (plist->res_type, "opaque")) {
	error ("illegal result type");
      }
      scan (TOK_IDENT, &tok);
      plist->proc_name = tok.str;
      scan (TOK_LPAREN, &tok);
      /* get args - first one */
      num_args = 1;
      isvoid = FALSE;
      /* type of DEF_PROGRAM in the first 
       * get_prog_declaration and DEF_STURCT in the next
       * allows void as argument if it is the only argument
       */
      get_prog_declaration (&dec, DEF_PROGRAM, num_args);
      if (streq (dec.type, "void"))
	isvoid = TRUE;
      decls = ALLOC (decl_list);
      plist->args.decls = decls;
      decls->decl = dec;
      tailp = &decls->next;
      /* get args */
      while (peekscan (TOK_COMMA, &tok)) {
	num_args++;
	get_prog_declaration (&dec, DEF_STRUCT,
			      num_args);
	decls = ALLOC (decl_list);
	decls->decl = dec;
	*tailp = decls;
	if (streq (dec.type, "void"))
	  isvoid = TRUE;
	tailp = &decls->next;
      }
      /* multiple arguments are only allowed in newstyle */
      if (!newstyle && num_args > 1) {
	error ("only one argument is allowed");
      }
      if (isvoid && num_args > 1) {
	error ("illegal use of void in program definition");
      }
      *tailp = NULL;
      scan (TOK_RPAREN, &tok);
      scan (TOK_EQUAL, &tok);
      scan_num (&tok);
      scan (TOK_SEMICOLON, &tok);
      plist->proc_num = tok.str;
      plist->arg_num = num_args;
      *ptailp = plist;
      ptailp = &plist->next;
      peek (&tok);
    } while (tok.kind != TOK_RBRACE);
    *ptailp = NULL;
    *vtailp = vlist;
    vtailp = &vlist->next;
    scan (TOK_RBRACE, &tok);
    scan (TOK_EQUAL, &tok);
    scan_num (&tok);
    vlist->vers_num = tok.str;
    /* make the argument structure name for each arg */
    for (plist = vlist->procs; plist != NULL;
	 plist = plist->next) {
      plist->args.argname = make_argname (plist->proc_name,
					  vlist->vers_num);
      /* free the memory ?? */
    }
    scan (TOK_SEMICOLON, &tok);
    scan2 (TOK_VERSION, TOK_RBRACE, &tok);
  } while (tok.kind == TOK_VERSION);
  scan (TOK_EQUAL, &tok);
  scan_num (&tok);
  defp->def.pr.prog_num = tok.str;
  *vtailp = NULL;
}


static void
def_enum (definition * defp)
{
  token tok;
  enumval_list *elist;
  enumval_list **tailp;

  defp->def_kind = DEF_ENUM;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_LBRACE, &tok);
  tailp = &defp->def.en.vals;
  do {
    scan (TOK_IDENT, &tok);
    elist = ALLOC (enumval_list);
    elist->name = tok.str;
    elist->assignment = NULL;
    scan3 (TOK_COMMA, TOK_RBRACE, TOK_EQUAL, &tok);
    if (tok.kind == TOK_EQUAL) {
      scan_num (&tok);
      elist->assignment = tok.str;
      scan2 (TOK_COMMA, TOK_RBRACE, &tok);
    }
    *tailp = elist;
    tailp = &elist->next;
  } while (tok.kind != TOK_RBRACE);
  *tailp = NULL;
}

static void
def_const (definition * defp)
{
  token tok;

  defp->def_kind = DEF_CONST;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_EQUAL, &tok);
  scan2 (TOK_IDENT, TOK_STRCONST, &tok);
  defp->def.co = tok.str;
}

static void
def_union (definition * defp)
{
  token tok;
  declaration dec;
  case_list *cases;
  case_list **tailp;
  int flag;

  defp->def_kind = DEF_UNION;
  scan (TOK_IDENT, &tok);
  defp->def_name = tok.str;
  scan (TOK_SWITCH, &tok);
  scan (TOK_LPAREN, &tok);
  get_declaration (&dec, DEF_UNION);
  defp->def.un.enum_decl = dec;
  tailp = &defp->def.un.cases;
  scan (TOK_RPAREN, &tok);
  scan (TOK_LBRACE, &tok);
  scan (TOK_CASE, &tok);
  while (tok.kind == TOK_CASE) {
    scan2 (TOK_IDENT, TOK_CHARCONST, &tok);
    cases = ALLOC (case_list);
    cases->case_name = tok.str;
    scan (TOK_COLON, &tok);
    /* now peek at next token */
    flag = 0;
    if (peekscan (TOK_CASE, &tok)) {

      do {
	scan2 (TOK_IDENT, TOK_CHARCONST, &tok);
	cases->contflag = 1;	/* continued case statement */
	*tailp = cases;
	tailp = &cases->next;
	cases = ALLOC (case_list);
	cases->case_name = tok.str;
	scan (TOK_COLON, &tok);

      } while (peekscan (TOK_CASE, &tok));
    }
    else if (flag) {

      *tailp = cases;
      tailp = &cases->next;
      cases = ALLOC (case_list);
    };

    get_declaration (&dec, DEF_UNION);
    cases->case_decl = dec;
    cases->contflag = 0;	/* no continued case statement */
    *tailp = cases;
    tailp = &cases->next;
    scan (TOK_SEMICOLON, &tok);

    scan3 (TOK_CASE, TOK_DEFAULT, TOK_RBRACE, &tok);
  }
  *tailp = NULL;
  if (tok.kind == TOK_DEFAULT) {
    scan (TOK_COLON, &tok);
    get_declaration (&dec, DEF_UNION);
    defp->def.un.default_decl = ALLOC (declaration);
    *defp->def.un.default_decl = dec;
    scan (TOK_SEMICOLON, &tok);
    scan (TOK_RBRACE, &tok);
  }
  else {
    defp->def.un.default_decl = NULL;
  }
}

static char *reserved_words[] =
{
  "array",
  "bytes",
  "destroy",
  "free",
  "getpos",
  "inline",
  "pointer",
  "reference",
  "setpos",
  "sizeof",
  "union",
  "vector",
  NULL
};

static char *reserved_types[] =
{
  "opaque",
  "string",
  NULL
};

/* check that the given name is not one that would eventually result in
   xdr routines that would conflict with internal XDR routines. */
static  void
check_type_name (char *name, int new_type)
{
  int i;
  char tmp[100];

  for (i = 0; reserved_words[i] != NULL; i++) {
    if (strcmp (name, reserved_words[i]) == 0) {
      sprintf (tmp,
	       "illegal (reserved) name :\'%s\' in type definition", name);
      error (tmp);
    }
  }
  if (new_type) {
    for (i = 0; reserved_types[i] != NULL; i++) {
      if (strcmp (name, reserved_types[i]) == 0) {
	sprintf (tmp,
		 "illegal (reserved) name :\'%s\' in type definition", name);
	error (tmp);
      }
    }
  }
}

static void
def_typedef (definition * defp)
{
  declaration dec;

  defp->def_kind = DEF_TYPEDEF;
  get_declaration (&dec, DEF_TYPEDEF);
  defp->def_name = dec.name;
  check_type_name (dec.name, 1);
  defp->def.ty.old_prefix = dec.prefix;
  defp->def.ty.old_type = dec.type;
  defp->def.ty.rel = dec.rel;
  defp->def.ty.array_max = dec.array_max;
}

static void
get_declaration (declaration * dec, defkind dkind)
{
  token tok;

  get_type (&dec->prefix, &dec->type, dkind);
  dec->rel = REL_ALIAS;
  if (streq (dec->type, "void")) {
    return;
  }

  check_type_name (dec->type, 0);

  scan2 (TOK_STAR, TOK_IDENT, &tok);
  if (tok.kind == TOK_STAR) {
    dec->rel = REL_POINTER;
    scan (TOK_IDENT, &tok);
  }
  dec->name = tok.str;
  if (peekscan (TOK_LBRACKET, &tok)) {
    if (dec->rel == REL_POINTER) {
      error ("no array-of-pointer declarations -- use typedef");
    }
    dec->rel = REL_VECTOR;
    scan_num (&tok);
    dec->array_max = tok.str;
    scan (TOK_RBRACKET, &tok);
  }
  else if (peekscan (TOK_LANGLE, &tok)) {
    if (dec->rel == REL_POINTER) {
      error ("no array-of-pointer declarations -- use typedef");
    }
    dec->rel = REL_ARRAY;
    if (peekscan (TOK_RANGLE, &tok)) {
      dec->array_max = "~0";	/* unspecified size, use max */
    }
    else {
      scan_num (&tok);
      dec->array_max = tok.str;
      scan (TOK_RANGLE, &tok);
    }
  }
  if (streq (dec->type, "opaque")) {
    if (dec->rel != REL_ARRAY && dec->rel != REL_VECTOR) {
      error ("array declaration expected");
    }
  }
  else if (streq (dec->type, "string")) {
    if (dec->rel != REL_ARRAY) {
      error ("variable-length array declaration expected");
    }
  }
}

static void
get_prog_declaration (declaration * dec, defkind dkind, int num)
		  /* arg number */
{
  token tok;
  char name[10];		/* argument name */

  if (dkind == DEF_PROGRAM) {
    peek (&tok);
    if (tok.kind == TOK_RPAREN) {	/* no arguments */
      dec->rel = REL_ALIAS;
      dec->type = "void";
      dec->prefix = NULL;
      dec->name = NULL;
      return;
    }
  }
  get_type (&dec->prefix, &dec->type, dkind);
  dec->rel = REL_ALIAS;
  if (peekscan (TOK_IDENT, &tok))	/* optional name of argument */
    strcpy (name, tok.str);
  else
    sprintf (name, "%s%d", ARGNAME, num);	/* default name of argument */

  dec->name = (char *) strdup (name);

  if (streq (dec->type, "void")) {
    return;
  }

  if (streq (dec->type, "opaque")) {
    error ("opaque -- illegal argument type");
  }
  if (peekscan (TOK_STAR, &tok)) {
    if (streq (dec->type, "string")) {
      error ("pointer to string not allowed in program arguments\n");
    }
    dec->rel = REL_POINTER;
    if (peekscan (TOK_IDENT, &tok))	/* optional name of argument */
      dec->name = (char *) strdup (tok.str);
  }
  if (peekscan (TOK_LANGLE, &tok)) {
    if (!streq (dec->type, "string")) {
      error ("arrays cannot be declared as arguments to procedures -- use typedef");
    }
    dec->rel = REL_ARRAY;
    if (peekscan (TOK_RANGLE, &tok)) {
      dec->array_max = "~0";	/* unspecified size, use max */
    }
    else {
      scan_num (&tok);
      dec->array_max = tok.str;
      scan (TOK_RANGLE, &tok);
    }
  }
  if (streq (dec->type, "string")) {
    if (dec->rel != REL_ARRAY) {	/* .x specifies just string as
					 * type of argument 
					 * - make it string<>
					 */
      dec->rel = REL_ARRAY;
      dec->array_max = "~0";	/* unspecified size, use max */
    }
  }
}



static void
get_type (char **prefixp, char **typep, defkind dkind)
{
  token tok;

  *prefixp = NULL;
  get_token (&tok);
  switch (tok.kind) {
  case TOK_IDENT:
    *typep = tok.str;
    break;
  case TOK_STRUCT:
  case TOK_ENUM:
  case TOK_UNION:
    *prefixp = tok.str;
    scan (TOK_IDENT, &tok);
    *typep = tok.str;
    break;
  case TOK_UNSIGNED:
    unsigned_dec (typep);
    break;
  case TOK_SHORT:
    *typep = "short";
    (void) peekscan (TOK_INT, &tok);
    break;
  case TOK_LONG:
    *typep = "long";
    (void) peekscan (TOK_INT, &tok);
    break;
  case TOK_HYPER:
    *typep = "longlong_t";
    (void) peekscan (TOK_INT, &tok);
    break;
  case TOK_VOID:
    if (dkind != DEF_UNION && dkind != DEF_PROGRAM) {
      error ("voids allowed only inside union and program definitions with one argument");
    }
    *typep = tok.str;
    break;
  case TOK_STRING:
  case TOK_OPAQUE:
  case TOK_CHAR:
  case TOK_INT:
  case TOK_FLOAT:
  case TOK_DOUBLE:
  case TOK_BOOL:
    *typep = tok.str;
    break;
  default:
    error ("expected type specifier");
  }
}

static void
unsigned_dec (char **typep)
{
  token tok;

  peek (&tok);
  switch (tok.kind) {
  case TOK_CHAR:
    get_token (&tok);
    *typep = "u_char";
    break;
  case TOK_SHORT:
    get_token (&tok);
    *typep = "u_short";
    (void) peekscan (TOK_INT, &tok);
    break;
  case TOK_LONG:
    get_token (&tok);
    *typep = "u_long";
    (void) peekscan (TOK_INT, &tok);
    break;
  case TOK_HYPER:
    get_token (&tok);
    *typep = "u_longlong_t";
    (void) peekscan (TOK_INT, &tok);
    break;
  case TOK_INT:
    get_token (&tok);
    *typep = "u_int";
    break;
  default:
    *typep = "u_int";
    break;
  }
}
